New Scientist: Invisibility cloaks could take sting out of tsunamis
29 September 2008 - Invisibility cloaks that are able to steer light around two dimensional objects have become reality in the last few years. But the first real-world application of the theories that made them possible could be in hiding vulnerable coastlines and offshore platforms from destructive tsunamis. [...] Stefan Enoch at the Fresnel Institute in Marseille, France, says that established cloaking principles could be applied to ocean waves, which are essentially two-dimensional. Such techniques could be used to render vulnerable coastlines or offshore platforms invisible to damaging waves, he says. [...]
ballast
Such a structure could conceivably be of use for more than dissipiation/deflection of wave force. It could also be ballast for the superstructure of the seastead, the concentric rings of pillars could be supports for a platform, or containers for shellfish aquaculture, or a variety of other uses...